Chair frame



FIG. 1 is a perspective view of a chair frame showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a perspective view thereof in a state of use.

The dashed broken lines illustrate portions of the chair frame and form no part of the claimed design. The dot-dash broken lines in FIG. 8 illustrate environmental structure and form no part of the claimed design. 

CLAIM The ornamental design for a chair frame, as shown and described. 